[ltt-dev] Trace of the Module example with lttv gui on Beagle

[Mathieu Desnoyers]

* fabien royer (fabroy01 at googlemail.com) wrote:
> Hi all,
> 
> 
> I have installed successfully the LTTng on the beagle board and compile the
> sample kernel modules.
> 
> 
> 
> I would like to trace some part of the Linux kernel and I am starting with
> the module examples. However I am not quite sure to understand. If  I am
> using lttv-gui to trace the marker example, it makes no difference to me
> than when I don’t run it ! I mean to say I don’t understand where the
> important data is while looking at the lttv gui as it just look the same to
> me when I run the example and when I don’t.
> 
> 
> 
> I am using Linux Trace Toolkit Visualizer 0.12.30-02102010 and Linux
> beagleboard 2.6.33.1-ga0ff4c3
> 
> Can please someone tell know if I am doing it the right way first and then
> let me know what is the critical information I should see with the marker
> and traepoint example within the llt viewer.
> 

There are a few ways to precisely get your info. You can either:

lttv -m textDump -t path_to_trace |grep "some ascii text expected"

or

use the filter (available both in the gui and textDump) to filter by
channel and event name.

Mathieu

> 
> 
> Thanks in advance,
> 
> Regards,
> 
> Fabien
> 
> 
> 
> $ dmesg
> 
> …..
> 
> …..
> 
> LTT state dump begin
> 
> LTT state dump thread start
> 
> LTT state dump end
> 
> example init
> 
> Value 123, string example string
> 
> example exit
> 
> Number of event b : 10
> 
> LTT: 367 events written in channel syscall_state (cpu 0, index 0)
> 
> LTT: 32 events written in channel softirq_state (cpu 0, index 0)
> 
> LTT: 131 events written in channel task_state (cpu 0, index 0)
> 
> LTT: 359 events written in channel fd_state (cpu 0, index 0)
> 
> LTT: 3092 events written in channel vm_state (cpu 0, index 0)
> 
> LTT: 17 events written in channel irq_state (cpu 0, index 0)
> 
> LTT: 3 events written in channel netif_state (cpu 0, index 0)
> 
> LTT: 1 events written in channel global_state (cpu 0, index 0)
> 
> LTT: 34235 events written in channel kernel (cpu 0, index 0)
> 
> LTT: 1758 events written in channel mm (cpu 0, index 0)
> 
> LTT: 5992 events written in channel fs (cpu 0, index 0)
> 
> LTT: 1110 events written in channel rcu (cpu 0, index 0)
> 
> LTT: 4421 events written in channel net (cpu 0, index 0)
> 
> LTT: 352 events written in channel block (cpu 0, index 0)
> 
> LTT: 298 events written in channel metadata (cpu 0, index 0)

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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com